Valve-grinding compound



vehicle for the UNITED STATES PATENT OFFICE.

JOHN v. wroxs, or SEATTLE,

WASHINGTON, ASSIGNOR TO MARVEL MANUFACTUR- ING- GO., 0]? SEATTLE, WASHINGTON, A FIRM COMIOSED 01 W. D. TBIPPLE,

GEORGE TRIPPIIE, AND J. V. WIGKS.

VALVE-GRINDING comrouivn.

Be it known that I, JOHN citizen of the United States,

V. Wrens, a

and resident of Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Valve-Grinding Compounds, of which the following is a specification. J

My invention consists of an improvement incompounds forgrinding valves, such, for instance, as the valves of an internal combustion engine.

It is essential, in-this work, that the compound be of such character that small particles will not fall from the valve seat, while in use or while being made ready for grinding, and in this manner enter the cylinder. It is an object of my invention to form a compound which will be of such a character and consistency, under all conditions, that it will not permit particles to be separated from the mass, but which will permit the abrasive to work freely and quickly upon the valve seat.

Another object of'my invention is to produce a valve grinding compound which will cut rapidly, without scoring or forming rings in the valve or its seat.

nother object of my invention is to orm a superior valve grindin compound which ma be sold ready-mixe and which will require the addition of no other ingredients in use.

The com 'ound which is my invention will be hereinafter described in this specification, and those materials and combinations thereof, and the roportions which I consider preferable, will be particularly set forth in the appended claims.

As the base for my compound I employ a non-fluid oil. This oil, which forms the other elements, should be such that it will not become fluid under ordinary temperatures, nor under the tem-- peratures attained during the action of grinding. For such purposes I have found petroleum hard oil to be suitable.

With this hard oil I mix a powdered or pulverized abrasive, such as carborundum,

which. will abrade the very hard valve seats.

Specification of Letters Patent.

Patented June 21, 1921.

Application filed June 3, 1920. Serial No. 386,327.

For varying conditions of work, and for varlations 1n the speed of cutting and smoothness of finish desired, various grades of abrasive may be used. I have employed carborundum varying from No. F1 to 180 grade, although it is obvious that for a finer finish a finer grade of abrasive than N 0. F1 might be employed, or for a rougher finish, a coarser em loyed. g

he third ingredient which I employ is known as lard oil. This oil appears to assist materially in the abrasive action, although the rinciple of its action is not understood. t may be that this oil prevents the formation of a film between the grinding surfaces, and it may assist in removing the minute particles which are ground away. Other similar oils mightbe employed, but I have found that the best results are secured when lard oil is employed.

The three ingredients named, or their equivalents, are thoroughly intermixed, and the product is a paste which is ready for use, without the addition of other substances. The proportions may be varied to suit the purpose for which the compound is tobe used, but in general I have found that the best results are secured, in valve when the substances named are grade than 180 might be mixed in equal proportions by weight. I do not dewithout becoming fluid. If it is desired to grinding,

produce a very smooth finish, the proportion of lard 011 mi ht be increased. Other considerations mi'g increase the proportion of any two of the ingredients with respect to the other.

Although my compound is particularly designed for and peculiarly adapted for valve rinding, it may be used for any purp se or which it is found suitable, or in t make it desirable to any place where it is desired to produce a ing petroleum hard oil, a pulverized abrasmooth surface with Very little efiort and sive, and lard oi1,' intermixed. quickly. I do not desire to be understood 3. A valve rinding compound comprisas limiting the use of my grlndlng c'oming substantia ly equal parts by weight of 5 pound to the sole use of gr nding valves. petroleum hard oil, carborundum, and lard 15 What I claim as my invention is oil intermixed. 1. A valve grinding compound comprissigned at Seattle, Washington, this 28th ing a non-fluld oleaginous vehlcle, an abraday of May, 1920. sive and lard oil intermixed therewith. 10 2. A valve grinding compound compris- JOHN V. WICKS. 

